jezeli-0circandltalphaandlt90circ-oraz-tgalpha2sinalpha-to
Zadanie
Jeżeli oraz , to
A)
\displaystyle \cos\alpha= \frac{1}{2}
B)
\displaystyle \cos\alpha= \frac{\sqrt{2}}{2}
C)
\displaystyle \cos\alpha= \frac{\sqrt{3}}{2}
D)
\cos\alpha=1
Jeżeli oraz , to
\displaystyle \cos\alpha= \frac{1}{2}
\displaystyle \cos\alpha= \frac{\sqrt{2}}{2}
\displaystyle \cos\alpha= \frac{\sqrt{3}}{2}
\cos\alpha=1